Dell PowerEdge FX2 Dell PowerEdge FN I/O Aggregator Configuration Guide 9.6(0 - Page 114
Information Monitored in iSCSI Traffic Flows
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You can configure the switch to monitor traffic for additional port numbers or a combination of port number and target IP address, and you can remove the well-known port numbers from monitoring. Information Monitored in iSCSI Traffic Flows iSCSI optimization examines the following data in packets and uses the data to track the session and create the classifier entries that enable QoS treatment: • Initiator's IP Address • Target's IP Address • ISID (Initiator defined session identifier) • Initiator's IQN (iSCSI qualified name) • Target's IQN • Initiator's TCP Port • Target's TCP Port If no iSCSI traffic is detected for a session during a user-configurable aging period, the session data clears. Synchronizing iSCSI Sessions Learned on VLT-Lags with VLT-Peer The following behavior occurs during synchronization of iSCSI sessions. • If the iSCSI login request packet is received on a port belonging to a VLT lag, the information is synced to the VLT peer and the connection is associated with this interface. • Additional updates to connections (including aging updates) that are learnt on VLT lag members are synced to the peer. • When receiving an iSCSI login request on a non-VLT interface followed by a response from a VLT interface, the session is not synced since it is initially learnt on a non-VLT interface through the request packet. • The peer generates a new connection log that sees the login response packet. If the login response packet uses the ICL path, it is seen by both the peers, which in turn generate logs for this connection. iSCSI Optimization: Operation When the Aggregator auto-configures with iSCSI enabled, the following occurs: • Link-level flow control is enabled on PFC disabled interfaces. • iSCSI session snooping is enabled. • iSCSI LLDP monitoring starts to automatically detect EqualLogic arrays. iSCSI optimization requires LLDP to be enabled. LLDP is enabled by default when an Aggregator autoconfigures. The following message displays when you enable iSCSI on a switch and describes the configuration changes that are automatically performed: %STKUNIT0-M:CP %IFMGR-5-IFM_ISCSI_ENABLE: iSCSI has been enabled causing flow control to be enabled on all interfaces. EQL detection and enabling iscsi profile-compellent on an interface may cause some automatic configurations to 114 iSCSI Optimization